<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avater_box">
                <img src="../assets/logo.png">
             </div>
            <!-- 登录表单区域 -->
            <el-form  label-width="0px" class="login_form" ref="loginFormRef" :model="loginForm" :rules="loginFormRules">
                <!-- 用户名 -->
                <el-form-item  prop="username" >
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"/>
                </el-form-item>
                <!-- 密码 -->
                 <el-form-item prop="password">
                    <el-input  type="password" v-model="loginForm.password" prefix-icon="el-icon-s-goods"/>
                </el-form-item>
                <!-- 按钮区域 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
    </div>
 </div>
</template>

<script>
export default {
  data () {
    return {
      // 登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 登录表单验证规则对象
      loginFormRules: {
        // 用户名的验证规则
        username: [{ required: true, message: '请输入用户名称', trigger: 'blur' },
          { min: 3, max: 5, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 密码的校验规则
        password: [{ required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }]
      }
    }
  },
  methods: {
    // 点击重置按钮，重置登录表单
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
    // 登录的预验证
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        console.log(res)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        // 1.将登录成功之后的token，保存到客户端的sessionStorage中
        //     1.1项目中除了登录之外的其他API接口，必须在登录之后才能访问
        //     1.2token只应当在当前网站打开期间生效，所以讲token保存在sessionStorage中
        window.sessionStorage.setItem('token', res.data.token)
        // 2.通过编程时导航跳转到后台主页，路由地址是/home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style  lang="less" scoped>
.login_container{
    //  background-image: '../assets/login.jpg';
    background-color: #2b4b6b;
    height: 100%;
}
.login_box{
    width:450px;
    height:350px;
    background-color:#fff ;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top:50%;
    transform: translate(-50%,-50%);
}
.avater_box{
    width:130px;
    height:130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left:50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
    img{
        width:100%;
        height:100%;
        border-radius: 50%;
        background-color: #eee;
    }
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
.btns{
        display: flex;
        justify-content: flex-end;
    }
</style>
